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шығын тиімділігі
The cost of an emission control measure assessed in terms of dollars-per-pound, or dollars-per-ton, of air emissions reduced.
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Күлгін Сәрсенбі
Ash Wednesday is observed by Christians. Marking the first day of Lent, which lasts until Easter (a period of 46 days), it is the day of repentance. ...
